﻿r86 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  streams 
  have 
  entered 
  at 
  this 
  elevation, 
  their 
  mouths 
  are 
  marked 
  by 
  

   prevailingly 
  coarse 
  gravel. 
  On 
  the 
  east 
  side 
  of 
  the 
  valley 
  beginning 
  

   at 
  South 
  Dauby 
  creek 
  and 
  travelling 
  northward 
  for 
  about 
  one 
  mile, 
  

   when 
  the 
  next 
  stream 
  debouching 
  into 
  the 
  valley 
  is 
  reached, 
  and, 
  at 
  

   about 
  the 
  1070 
  foot 
  elevation, 
  are 
  found 
  distinct 
  cuts 
  or 
  benches 
  in 
  

   the 
  till, 
  covered 
  in 
  some 
  cases 
  at 
  their 
  bases 
  with 
  water 
  worn 
  

   material, 
  which 
  are 
  probably 
  modifications 
  in 
  part 
  resulting 
  from 
  

   wave 
  action. 
  

  

  The 
  outlet 
  to 
  the 
  West 
  Dan 
  by 
  lake 
  was 
  at 
  Spencer 
  Summit 
  with 
  

   an 
  elevation 
  of 
  1039 
  feet. 
  (Figure 
  2) 
  When 
  the 
  ice 
  com- 
  

   menced 
  its 
  northward 
  retreat 
  uncovering 
  the 
  divide 
  region 
  in 
  the 
  

   southern 
  parts 
  of 
  the 
  valleys 
  of 
  the 
  Finger-lake 
  region, 
  the 
  waters 
  

   were 
  ponded 
  back 
  between 
  the 
  divides 
  and 
  the 
  ice 
  front 
  and 
  held 
  

   up 
  to 
  the 
  heights 
  of 
  the 
  divides 
  in 
  their 
  respective 
  valleys. 
  This 
  

   condition 
  marked 
  the 
  beginning 
  of 
  the 
  epoch 
  of 
  local 
  lakes 
  in 
  sev- 
  

   eral 
  of 
  the 
  lake 
  valleys. 
  There 
  existed 
  such 
  a 
  lake 
  in 
  each 
  of 
  the 
  

   Finger-lake 
  valleys. 
  Of 
  these, 
  three, 
  probably, 
  had 
  their 
  birth 
  

   about 
  the 
  same 
  time 
  and 
  were 
  probably 
  the 
  iirst 
  to 
  make 
  their 
  

   records 
  of 
  a 
  long 
  and 
  successive 
  series 
  of 
  lakes 
  whose 
  mark- 
  

   ings 
  are 
  still 
  seen 
  to 
  be 
  so 
  distinct 
  and 
  traceable 
  in 
  most 
  of 
  the 
  val- 
  

   leys 
  of 
  the 
  central 
  New 
  York 
  lake 
  region. 
  

  

  The 
  West 
  Danby 
  stage 
  is 
  not 
  represented 
  by 
  sharp 
  and 
  well 
  

   defined 
  terraces 
  but 
  mainly 
  by 
  a 
  distinctly 
  traceable 
  overflow, 
  

   unlike 
  surface 
  conditions 
  above 
  and 
  below 
  the 
  outlet 
  level, 
  which 
  in 
  

   most 
  cases 
  are 
  very 
  faintly 
  developed 
  and 
  are 
  very 
  irregular. 
  Sev- 
  

   eral 
  indistinct 
  delta 
  terraces 
  are 
  found 
  along 
  a 
  few 
  of 
  the 
  streams 
  

   which 
  entered 
  at 
  the 
  lake 
  level. 
  The 
  best 
  one 
  yet 
  seen, 
  is 
  found 
  

   on 
  a 
  stream 
  which 
  enters 
  the 
  Inlet 
  valley 
  one 
  mile 
  north 
  of 
  South 
  

   Danby 
  creek 
  at 
  an 
  elevation 
  of 
  1071 
  feet. 
  On 
  all 
  of 
  the 
  streams 
  of 
  

   any 
  size 
  are 
  found 
  more 
  or 
  less 
  extensive 
  gravel 
  deposits, 
  but 
  not 
  in 
  

   the 
  form 
  of 
  true 
  deltas. 
  

  

  The 
  Danby 
  stage 
  marks 
  mainly 
  an 
  epoch 
  of 
  frontal 
  ice 
  accumula- 
  

   tions, 
  when 
  the 
  moraine 
  which 
  fills 
  the 
  Inlet 
  valley 
  to 
  a 
  very 
  great 
  

   but 
  unknown 
  depth, 
  w^as 
  in 
  process 
  of 
  construction, 
  and 
  which 
  

   extends 
  from 
  the 
  divide 
  to 
  within 
  a 
  few" 
  miles 
  south 
  of 
  Ithaca. 
  

   When 
  the 
  ice 
  had 
  withdrawn 
  as 
  far 
  north 
  as 
  Ithaca 
  from 
  the 
  Inlet 
  

   and 
  Six 
  Mile 
  creek 
  valleys, 
  the 
  waters 
  held 
  up 
  in 
  these 
  two 
  valleys 
  

   coalesced. 
  The 
  Danby 
  stage 
  was 
  quickly 
  closed 
  by 
  a 
  rapid 
  and 
  

  

  